What structure forms during angiosperm fertilization but does not form during fertilization among other types of plants?
This occurs when two sperm nuclei reach the interior of a female gametophyte, where one sperm will fertilise the egg cell to form a zygote, whereas the other usually fuses with the binucleate central cell, forming a primary endosperm cell, effectively constituting an organism separate from the growing embryo. Approximately 70% of angiosperm species have polyploid endosperm cells which are typically triploid (containing three sets of chromosomes), but can vary widely from diploid(2n) to 15n.
A client has been prescribed glucagon for the management of hypoglycemia. which nursing interventions should the nurse be prepared to provide this client for the management of possible adverse effects? select all that ap
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What is the difference between a pressurized water reactor in a boiling water reactor?
A) A pressurized water reactor does not use fission
B) A pressurized water reactor boils the water faster
C) A pressurized water reactor does not boil the water
D) A boiling water reactor is heated directly by the core
The correct answer is option C
A (BWR) boiling water reactor and a pressurized water reactor is a kind of light water reactors that is used to generate electricity.
The main difference between both the reactors is that a pressurized water reactor does not boils the water, the hot water exchanges heat to a low pressure water system which turns on the turbine to produce electric power.
The boiling water reactor boils the water and the steam produced by the water rotates the turbine to produce electricity.
Injecting a person with a killed-bacteria vaccine can protect that individual from disease because the proteins of the bacteria:
Remain in the body and live bacteria later prey on them instead of live tissue.
Bind with receptors in the body, so that live bacteria cannot bind with them later.
Stimulate the production of antibodies which can be manufactured later response to infection.,
_____________ figured out that red blood cells transport oxygen by binding to hemoglobin and was a serious rival to mendeleev and even split the award that named the co-discoverers of the "periodic law"
Claude Bernard figured out that red blood cells transport oxygen by binding to hemoglobin and was a serious rival to Mendeleev and even split the award that named the co-discoverers of the "periodic law."
What is the binding of oxygen to hemoglobin called?The binding of oxygen to hemoglobin is called oxyhemoglobin. This is formed when oxygen binds to the heme component of the protein hemoglobin in red blood cells.
This process of formation of oxyhemoglobin takes place in the pulmonary capillaries that are typically adjacent to the alveoli of the lungs.
It was the time when Mendeleev and Claude Bernard were busy with their work respectively. Both works are extremely important for each of them. And it may be thought that it was a serious rivalry between both in their respective fields.
Therefore, Claude Bernard figured out that red blood cells transport oxygen by binding to hemoglobin.
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Within the forebrain, the structure that plays a key role in the release of hormones by the pituitary gland is the:
A patient with single lung transplantation has a body temperature of 99° f, fatigue, shortness of breath, and an oxygen saturation level of 80 percent. which treatment may comfort this patient?
The nurse is caring for a client in labor. which assessment findings indicate to the nurse that the client is beginning the second stage of labor? select all that apply.
The offspring of a cross between parents with different true breeding traits
Answer:
Hybrid
Explanation:
The offspring of crosses between parents with different true breeding traits is called as hybrid. The true breeding parents are homozygous for the trait and carry two copies of either dominant or recessive allele for the trait. Crossing between two pure breeding parents produce a hybrid that is heterozygous for the trait. The hybrid carries one dominant and one recessive allele for the trait.
Fertilizer runoff from farms can get into groundwater and travel to nearby streams. Then, it can eventually end up in lakes. What is one result of excess fertilizer in a lake?
Excess fertilizer in a lake can lead to eutrophication, which causes an overgrowth of algae. This depletes dissolved oxygen, resulting in dead zones and potentially producing harmful toxins.
Explanation:One result of excess fertilizer in a lake is the process known as eutrophication. This occurs when the fertilizers, which are rich in phosphorus and nitrogen, are washed into bodies of water. The abundance of these nutrients causes an overgrowth of algae (algal blooms), which can deplete the dissolved oxygen in the water as they decay, leading to the death of aquatic life. This also results in the formation of what are known as 'dead zones,' where the lack of oxygen leads to a significant decline in the lake's biodiversity. Furthermore, some algal blooms can produce harmful toxins that pose health risks to humans and wildlife.
Hich of these facts provides the best support for the hypothesis that plants evolved from green algae? which of these facts provides the best support for the hypothesis that plants evolved from green algae? plants and green algae are photosynthetic. plants and green algae have chloroplasts. the chloroplasts of plants and green algae all have both chlorophyll a and
b.
The fact that provides the best support for the hypothesis that plants evolved from green algae is that the chloroplasts of both plants and green algae contain both chlorophyll a and b, indicating a close evolutionary relationship in their photosynthetic capabilities. Option C is the answer.
The presence of both chlorophyll a and b in the chloroplasts of both plants and green algae provides strong support for the hypothesis that plants evolved from green algae.
This shared characteristic suggests a close evolutionary relationship between these two groups, as chlorophyll a and chlorophyll b are the primary pigments involved in photosynthesis and are specific to photosynthetic organisms.
While options (a) and (b) are also true for both plants and green algae, the presence of specific chlorophyll types is a more specific and significant indicator of their evolutionary connection. So option C is correct.
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13. Why do cells need both tRNA and mRNA? (1 point)
Only mRNA can be used to repair mistakes in the DNA sequence.
Only tRNA bends into a shape that can carry specific amino acids.
The tRNA in used on the ribosomes and the mRNA is used in the nucleus.
The mRNA brings information to the nucleus for the tRNA to use.
14. (03.06 LC)
Mutation does not always affect the evolution of a species because (1 point)
not all mutations are inherited
not all mutations are beneficial
not all mutations cause visible change
not all mutations affect an entire species
15. (03.06 MC)
A chromosome that is exposed to a mutagen breaks into two pieces. A portion off one of the ends is removed before the two pieces rejoin. The mutation that occurs is (1 point)
deletion
duplication
inversion
non-disjunction
16. (03.06 MC)
Which of the following mutations is least likely to develop into a cancerous tumor? (1 point)
A non-disjunction mutation
A chromosomal deletion mutation
A inversion chromosomal mutation
A single point mutation
17. (03.06 MC)
The mutagens that result in cancer damage DNA by (1 point)
destroying the cell's p53 gene directly thereby increasing cell production
weakening the DNA strand or interfering with base paring
altering the cell's pH and allowing increased cell production
becoming a virus that attacks DNA directly, impairing duplication
Answer:
Answer 1: Option (C):The tRNA in used on the ribosomes and the mRNA is used in the nucleus.
Answer 2:Option(C): There is no effect on the phenotype of a specie, as most of the species DNA is altered and there are a few changes which occurs inside the phenotype of any specie exposed to mutation in general.
Answer 3:Option(A):Deletion is a type of mutation during which the part of the genetic sequence or DNA is not placed at its original position but the loss of the fragment occurs, in the process causing the change in the genome of the specie.
Answer 4:Option (B): The weakening the DNA strand or interfering with base pairing of the DNA sequence inside the DNA molecules.
Explanation:
tRNA is present inside the ribosomes, as it operates by detaching the required number of amino acids and letting the sequence change into the required proteins, which then goes out of the ribosomes into the cell body.Mutation has no such effect on the phenotype or the visible properties of any specie. As much of the mutation which occurs is in the DNA sequence of the specie which is exposed to the effect.Mutations basically brings change to the actual or original DNA sequence of the specie, as during the process a fragment or any part or sequence of nucleotide's are altered and are lost in the process to create a new DNA molecule, as the process is called as Deletion in the mutation term. As it will cause different disorders and the diseases inside the organism.Carcinogen, there are different elements which causes different alterations in the DNA and in the over all genome of the specie. As the DNA sequence is altered and in the base pairing of the sequences inside the genome of the species.The pseudostratified ciliated columnar epithelium of the trachea ________. the pseudostratified ciliated columnar epithelium of the trachea ________. lines the airway that is held open by c-shaped cartilaginous rings produces mucus to trap dust particles, bacteria, and other debris produces mucus to trap dust particles, bacteria, and other debris; sweeps the mucus toward the throat, where it can be expelled or swallowed; and lines the airway that is held open by c-shaped cartilaginous rings sweeps the mucus toward the throat, where it can be expelled or swallowed
Which labeled cell part contains DNA that codes for protein?
The cellular machinery responsible for assembling proteins, known as ribosomes, are synthesized in the nucleus (plural, nuclei), which also houses the genetic material, or DNA, of the cell. Therefore, R.
What is a nucleus?When discussing genomics, the term "nucleus" refers to the organelle within a cell that is surrounded by a membrane and houses the chromosomes. The nuclear membrane has a network of pores that allow for the controlled entry and exit of particular molecules (like proteins and nucleic acids) into and out of the nucleus.
The nucleus, which is also where ribosomes are made, houses the genetic material, or DNA, of the cell. The biological components known as ribosomes are in charge of assembling proteins.
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what is the greenhouse effet. Why is the greenhouse effect so important to life on Earht
The graph shown above is from one of the most well-known and on-going ecological studies ever performed. Isle Royal National Park, an island on Lake Superior, keeps data of populations of wolves and moose living there. The moose are a major food source for the wolves. Since the warming of the climate by El Nino in 1998, the tick population on the island has increased. Ticks cause anemia and hair loss in animals. These factors can expose animals to hypothermia in cold weather. Scientists are hoping to incorporate all three factors in their research. What would be an appropriate research question to guide the scientists?
A)
Moose death is directly related to an increase in the tick population.
B)
How does an increase in the tick population impact the survival of the wolves?
C)
If the moose population increase, would we expect an increase in the wolf or tick population?
D)
What is the relationship between an increase in the tick population and the death rate of the moose and wolves?
the the answer would be D.
A plant with the dominant trait, wrinkled seeds, is crossed with a plant that has non-wrinkled seeds. All of the offspring are all wrinkled-seeded. What is the likelihood that the gametes of the wrinkled-seeded parent plant contain one non-wrinkled allele?
The nurse is preparing discharge teaching for a client who has chronic obstructive pulmonary disease (copd). which teaching about deep breathing will the nurse include?
Both frogs and ducks have webbed feet. However ducks are more closely related to perching birds than to frogs.
Explain the process that has resulted in both frogs and ducks having feet that are similar
In eukaryotic cells, chromosomes are composed of both dna and proteins. true or false?
Final answer:
The statement is true; eukaryotic chromosomes are made up of DNA and proteins, forming a structure known as chromatin. This structure is only organized into distinct chromosomes during cell division, otherwise existing as a less condensed chromatin form within the nucleus.
Explanation:
The statement that eukaryotic chromosomes are composed of both DNA and proteins is true. In eukaryotic cells, DNA forms a complex with histone proteins to create chromatin, which makes up the substance of the chromosomes. Chromosomes are essential structures within the nucleus that contain the hereditary material, organized into a specific number for each eukaryotic species.
During the growth and maintenance phases of a cell's life cycle, the chromosomes are not easily distinguishable. Instead, they are present in a less condensed form known as chromatin, which is an unwound, jumbled arrangement of these DNA-protein complexes. This structure becomes more condensed and organized into clearly visible chromosomes only when a cell is preparing to divide.
The entire genetic content of a cell is known as its genome. In eukaryotic cells, the chromosomes play a crucial role in the genetic organization, whereas in prokaryotes, the DNA is typically found in a single, circular chromosome form that is not associated with proteins in the same way.
Which of the following was not a focus for students at Gilbert H. Hood Middle School in their “going green” program? a. wildlife conservation b. waste reduction c. recycling d. energy conservation
Correct answer: A). Wildlife conservation
A wildlife conservation was not an aim for the student at the Gilbert H. Hood middle school in their green program. Their main aim was to promote a greener lifestyle that will result in reduced energy cost and reduced carbon emission which would result in decreased environmental pollution and lead to a healthy life.
How does the large amount of genetic variation observed in prokaryotes arise? see concept 27.2 (page 576) view available hint(s) how does the large amount of genetic variation observed in prokaryotes arise? see concept 27.2 (page 576) the mutation rate in prokaryotes is much higher than in eukaryotes. they have extremely short generation times and large populations. they can exchange dna with many types of prokaryotes by way of horizontal gene transfer. they have a relatively small genome. the second and third answers are correct?
Final answer:
Genetic variation in prokaryotes is primarily because They have extremely short generation times and large populations and They can exchange DNA with many types of prokaryotes by way of horizontal gene transfer.
Explanation:
The large amount of genetic variation observed in prokaryotes arises through several key mechanisms:
They have extremely short generation times and large populations, which contributes to a higher chance of mutations that can create genetic diversity.Horizontal gene transfer (HGT) is another significant way through which prokaryotes can exchange DNA, not only with closely related species but even with distantly related ones. This occurs through processes such as transformation, transduction, and conjugation.These factors combined contribute to the rapid evolution of prokaryotes, allowing them to adapt quickly to environmental changes.
Viruses do not generate by chance. the programmer of a virus, known as a virus author, intentionally writes a virus program. writing a virus program usually requires significant programming skills. the virus author ensures the virus can ____ itself, conceal itself, monitor for certain events, and then deliver its payload. "
How do living organisms create macromolecules, organelles, cells, tissues, and complex higher-order structures? select one:
a. living organisms create order using energy from food molecules.
b. living organisms create order by using energy from the sun.
c. living organisms create order locally, but the energy transformations generate waste heat that increases the entropy of the universe as a whole.
d. the laws of thermodynamics do not apply to living organisms?
The following is an excerpt from the case study "It's All Greek to Me": "I am sorry to give you bad news. Nikoleta does have anemia but, unfortunately, giving her a high iron formula was exactly the opposite of what should be done. Nikoleta's disorder has a genetic basis."
Iron is an important structural component of hemoglobin. Explain why this treatment failed and how the true cause of Nikoleta's anemia was discovered.
Answer:
The prime reason for the treatment to get failed that though she has been suffering from anemia, it does not prove that she is low in iron. Providing her treatment with iron would possibly give her more than she required in her body.
The actual reason for anemia in the given case would be the lack of function of the beta proteins in the hemoglobin. This can be found out by looking through the family history, that is, if the family had anemia then the condition could be inherited, and it can be determined via blood examinations.
Swine are vulnerable to infection by bird flu virus and human flu virus, which can both be present in an individual pig at the same time. when this occurs, it is possible for genes from bird flu virus and human flu virus to be combined. if the human flu virus contributes a gene for tamiflu resistance (tamiflu is an antiviral drug) to the new virus, and if the new virus is introduced to an environment lacking tamiflu, then what is most likely to occur?
a.the new virus will maintain its tamiflu-resistance gene, just in case of future exposure to tamiflu.
b.the tamiflu-resistance gene will undergo mutations that convert it into a gene that has a useful function in this environment.
c.if the tamiflu-resistance gene involves a cost, it will experience directional selection leading to reduction in its frequency.
d.if the tamiflu-resistance gene confers no benefit in the current environment, and has no cost, the virus will become dormant until tamiflu is present.
Final answer:
In the absence of Tamiflu, a Tamiflu-resistance gene in a new virus strain will likely persist in the population if it neither benefits nor incurs a cost to the virus, due to the lack of selective pressure.
Explanation:
The scenario described outlines a process where swine, acting as an intermediate host, allow for the reassortment of genetic material between bird flu virus and human flu virus, potentially leading to the formation of a new virus strain that carries a gene for Tamiflu resistance. Given the absence of Tamiflu in the new environment, the fate of the Tamiflu-resistance gene depends on its impact on the virus's fitness in that environment. If the gene confers no advantage and also does not incur any cost to the virus, it is likely to persist in the population due to genetic drift, as there is no selective pressure for or against it. This is supported by evolutionary principles which state that in the absence of selective pressure, neutral mutations (those that neither benefit nor harm the organism) can persist in the gene pool.
Multicellular organisms first appeared during the Mesozoic Era.
True or False?
It is false that the multicellular organisms first appeared during the Mesozoic Era.
What is an era?In geology, an era is a period that lasts for many hundred million years. It gives a name to a lengthy group of geological layers, according to geologists. The Mesozoic age, when dinosaurs inhabited the Earth, serves as an illustration.
Era of the Cambrian. The Cambrian Period is a crucial juncture in the evolution of life on Earth since it is when the majority of the major animal groupings first appear in the fossil record.
Precambrian multicellular creatures were not thought to have existed until the late 1950s. However, using radiometric dating methods, it was discovered that the fossils originally discovered in Southern Australia's Ediacara Hills date back to the late Precambrian.
Thus, the given sentence is false.
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If the xylem in a young tree is damaged, which process is first affected?
a. performing photosynthesis
b. transporting sugar to the roots
c. transporting water to the leaves
d. absorbing water from the soil
Xylem- brings glucose and nutrients up from the roots to the rest of the plant; This tissue is dead at maturity.
I'd say the closest answer is probably d. absorbing water from the soil.
Why is it necessary to liquefy air to separate its components?
The most harmful by-product of nuclear energy is:
A:acid rain
B:sulfur dioxide
C:carbon dioxide
D:radioactive waste